we learned today home prices, which drive so much of the economy, rose more last year than any te since that housing bubble. prices surging to their highest point in six years. so, is now the time to sell? or will the value keep rising? abc's david muir here right now. david? >> reporter: big questions tonight, diane. and the real estate experts i talked to cede said if the value of your home is completely recovered from the recession, then it might be a great time to sell. not a lot on the market, to a seller's dream. but even if you are not going to sell, economists say these housing numbers tonight are good news for you, too. this spike in home prices unthinkable just two years ago. economists who study prices across 20 american cities tonight revealing they see the biggest increase year to year in more than six years. home values up 5.5%. barbara come ran founded the largest real estate company in new york. >> we haven't seen this in probably seven years. >> reporter: so, what has buyers lining up? those historically low interest rates, still at lows not seen since the early 1970s.